Water is supplied throughout your home or building typically via copper pipe. New homes today are often constructed using different materials for water supply. Water is under pressure at approx 50 lbs per sq inch. So needless to say, if your copper pipe has degraded or not up to standard, it can and will spring a leak. Fittings can also leak. Typically you will see staining on the ceiling and/or walls as the first sign of a problem.
There are all kinds of plumbing leaks. Some can flood your home, while others are not nearly so damaging. Your approach to stopping a leak depends on the type of leak it is. If the leak is at a joint, tighten the joint. If the leak is in a pipe, remove the section that is leaking and replace it with a new section. Unfortunately, this is more easily said than done.
For example, when you turn a threaded galvanized steel pipe to unscrew it from its fitting at one end, you tighten the pipe into its fitting at the other end. With copper pipe, the new section must be sweat-soldered in place. Most pipe replacement jobs are best left to a plumber, but as a do-it-yourselfer, you may consider an alternative: the pipe patch.
For step by step instructions click here
Watch how this plumber solved a leaky pipe problem
Trying to find the location of the leak can be a challenge. Typically the copper pipes are run through wall frames and ceiling joists. When a leak occurs, that water can travel along the wood and drip at any point. The stain on your ceiling or wall may not be an indication that the leak is directly above or aside of that location.
If you do not have experience with replacing sections of pipe, then calling a plumber to take care of your plumbing emergency will be your best and least expensive choice. If you do nothing, you can develop mold within your home causing lots of other problems. Call a local emergency plumber and fix your leaky pipes!